JP2875593B2 - Wireless communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a plurality of signal transmitting devices that are installed along a track and transmit a train passing signal, and are installed at a construction site and receive the train passing signal. The present invention relates to a wireless communication system between alarm transmitting devices that generates an alarm.

(Conventional technology) Conventionally, during a track maintenance work during a train operation time, a guardian who watches the approach of a train is placed, and this watchman visually checks the approach of the train, and there is a danger to the maintenance worker. I was trying to inform you.

Alternatively, the watchman can carry a timetable, look at the timetable, contact the nearby station, and confirm the approach of the train,
The workers of the track maintenance work were informed of the danger.

Upon receiving the notice, the worker evacuated from the track, and confirmed that the train had passed before starting work.

However, in the above-mentioned method, since a dedicated person for watching the approach of the train must be set, human labor is required. In addition, since the approach of the train is manually checked, an oversight sometimes occurs, so that a warning is delayed, which may cause a serious danger to an operator.

As a method of solving such a problem, a signal transmission device is attached to a traffic signal installed along the rail, and a passage detection signal output from the traffic signal when a train passes or approaches, and an address is added from the signal transmission device. A method is conceivable in which the signal is transmitted as a train passing signal by radio waves, received by an alarm transmitting device at a track maintenance work site, and the worker is notified of the approach of the train. In this case, the alarm issued by the alarm transmission device may be generated based on a train passing signal from each signal transmission device within a certain range from the alarm transmission device,
It is sufficient that only each of the signal transmission devices is to be monitored.

(Problems to be Solved by the Invention) However, in the above-described method, when communication is performed between the alarm transmitting device and the plurality of signal transmitting devices using the same radio frequency, a large number of signal transmitting devices outside the monitoring target are used. If the emission of the radio wave is left to the user, the chance of emitting the radio wave of the signal transmission device being monitored is reduced, and the communication efficiency is reduced.

Therefore, an object of the present invention is to provide a wireless communication system that permits emission of radio waves only to a signal transmission device to be monitored and prevents a reduction in communication efficiency.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for transmitting a train passing signal from a warning transmitting device that receives a train passing signal and issuing a warning, within a range where the device can communicate wirelessly with the warning transmitting device. A designated signal is wirelessly transmitted to a signal transmitting device that transmits a signal, and only the signal transmitting device designated by the designated signal is allowed to emit radio waves.

(Operation) When an address of a signal transmission device to be monitored is input, the alarm generation device generates a designated signal including the address and transmits the signal to the signal transmission device by radio waves. Each signal transmission device within a range capable of receiving the radio wave detects the designated signal,
If the own signal is not included in the designation signal, emission of the radio wave is stopped thereafter, and if the own signal is included, the train passing signal or the like is transmitted thereafter by the radio wave.

(Embodiment) FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention. In FIG. 1, 1 is an alarm transmitting device carried by a construction supervisor at a track maintenance work site, 2a, 2b,..., 2f are traffic lights, 3a, 3b,.
3f is a signal transmitting device attached to each of the traffic lights 2a, 2b,..., 2f, and 4 is a rail through which the train passes. Where the traffic light
2a, 2b,..., 2f output passage detection signals for notifying when a train passes or approaches, and signal transmission devices 3a, 3b,.
f is the transmission detection signal, the address assigned to each signal transmission device is added to the signal, and the signal is transmitted as a train passage signal by radio waves. The alarm transmission device 1 is transmitted by radio waves from each signal transmission device as the train approaches. Receives a train passing signal and alerts workers in response to approaching trains to alert them of danger.

Next, the operation of this embodiment will be described with reference to FIGS. FIG. 2 shows the alarm transmitting device 1, the signal transmitting device 3
4 is an operation flowchart showing operations of a, 3b,..., 3f.

Prior to monitoring the train passing signal, a wireless transmission range in which the alarm transmitting device 1 and the signal transmitting device 3a can communicate wirelessly is confirmed. This confirmation is performed when the alarm transmission device 1 transmits an initial signal, all the signal transmission devices that have received the initial signal transmit response signals including their own addresses, and the alarm transmission device receives the response signal. It can be executed by extracting the address from the response signal and knowing the corresponding signal transmitting device. In FIG. 1, reference numeral 5 denotes a wireless transmission range, and the alarm transmitting device 1 can communicate with the signal transmitting devices 3b, 3c, 3d, and 3e within the range.

The supervisor of the track maintenance work determines a plurality of signal transmission devices to be monitored in consideration of the previously confirmed wireless transmission range. Then, the address is input to the alarm transmission device 1. The alarm transmitting device 1 writes and registers each input address in a memory (FIG. 2, step), generates a designation signal including each of the addresses and its own address, and transmits it to the signal transmitting device (FIG. 2, FIG. Steps). FIG. 5 shows an example of a message format of the designation signal. Each address, its own address, an identifier indicating the designation signal, and other necessary information are contained in an information portion. Signal transmitting devices 3b, 3c,
When receiving the radio wave from the alarm transmitting device 1, 3d and 3e check whether or not their information is included in the information portion of the designated signal (steps in FIG. 3). When the own address is included, it is determined that the address is specified as the monitoring target of the alarm transmission device 1, and the address of the alarm transmission device included in the information portion of the designated signal is taken out, written into the memory and registered ( FIG. Thereafter, the signal transmission device transmits a train passing signal until the designation is released,
Alternatively, predetermined information is transmitted in response to a request from the registered alarm transmission device.

When it is not designated as a monitoring target, for example, when the designated signal is not transmitted within a certain period of time after the response signal is transmitted to the alarm transmitting device 1, or even when the designated signal is transmitted, its own address is included. If not, the process proceeds to another process.

FIG. 3 is a block diagram showing an embodiment of the alarm transmitting apparatus 1 shown in FIG. 1, and executes the processing of steps 1 to 3 shown in FIG. In FIG. 3, terminals are operated by using a keyboard or the like of the operation / display unit 18 or externally.
Through 21, the address of the signal transmission device to be monitored is input. The input address is stored in the memory 19 via the control unit 20 and registered. The transmission data generator 12 generates a designation signal including the address according to a message format shown in FIG. The designation signal is transmitted to the transmitter 11 by FS.
The signal is K-modulated and transmitted from the antenna 16 via the switch 15. The receiver 13, the received data detector 14, the collision detector
17 and the like are means for receiving signals from the signal transmitting devices 3a to 3f shown in FIG. Further, the transmission frequency and the reception frequency are the same, and switching between transmission and reception is performed by the switch 15.

FIG. 4 is a block diagram showing an embodiment of the signal transmitting devices 3a, 3b,..., 3f shown in FIG. 1, and executes the processing of steps 1 to 3 shown in FIG. In FIG.
Radio waves from the alarm transmitting device are received by the antenna 36,
The signal is input to the receiver 33 via the switch 35. The receiver 33 amplifies and demodulates the input signal. The received data detector 34 extracts the information portion from the demodulated signal and checks whether it is the designated signal from the alarm transmitting device, and further, whether itself is designated. If the self is designated, the address of the alarm transmitting device in the designated signal is extracted, and the
Output to The memory 39 stores and registers the address under the control of the control unit 40. Note that the transmission data generator 31,
The transmitter 32, the transmission timing generator 37, the carrier detector 38 and the like are means for transmitting a signal to the alarm transmitting device. Further, the transmission frequency and the reception frequency are the same, and switching between transmission and reception is performed by the switch 35.

(Effects of the Invention) As described above in detail, according to the present invention, a designated signal is transmitted from an alarm transmitting device to a signal transmitting device to be monitored, and only the specified signal transmitting device passes through the train. Since a radio wave such as a signal is transmitted, transmission of a signal transmission device that is not monitored can be prevented, and communication efficiency can be improved by suppressing wireless transmission traffic.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is an operation flowchart for explaining the operation of an alarm transmission device / signal transmission device, FIG. 3 is a block diagram of an embodiment of the alarm transmission device, FIG. The figure shows a block diagram of an embodiment of the signal transmission device, and FIG.
The figure shows an example of a message format. 1 ... alarm transmitting device, 2a, 2b, 2f ... traffic light, 3a, 3b,
..., 3f ... signal transmission device, 4 ... wireless transmission range, 5 ...
Rail 6, monitoring range.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomoaki Kaneko 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Shuji Aramaki 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) G08B 25/10 B61L 23/06

Claims (1)

(57) [Claims] 1. A designated signal is wirelessly transmitted from an alarm transmitting device which receives a train passing signal and issues an alarm to a signal transmitting device which transmits a train passing signal within a range capable of wirelessly communicating with the alarm transmitting device. A radio communication system, wherein only the signal transmission device designated by the designation signal among the signal transmission devices is allowed to emit radio waves.